LXX Num 6:21

οὗτος ὁ νόμος τοῦ εὐξαμένου ὃς ἂν εὔξηται κυρίῳ δῶρον αὐτοῦ Κυρίῳ περὶ τῆς εὐχῆς, χωρὶς ων ἂν εὕρῃ ἡ χεὶρ αὐτοῦ, κατὰ δύναμιν τῆς εὐχῆς αὐτοῦ ἣν ἀν’ εὔξηται κατὰ νόμον ἁγνείας.

This is the law of the Nazirite who vows his offering to the LORD for his separation, in addition to whatever else he can afford; he must fulfill whatever vow he makes, according to the law of his separation.”